The user specified as a definer ('root'@'%') does not exist

[Yash Ganthe]

I use MySQL version 8.0.18
-- 8.0.18
select @@version ;

I have many stored procedure. Two of them have the following properties
SELECT routine_name, definer
FROM INFORMATION_SCHEMA.ROUTINES
WHERE ROUTINE_TYPE = 'PROCEDURE'
and routine_schema='raloa2'
and routine_name in ('save_stop', 'get_stops')
;

This returns:
get_stops root@localhost
save_stop root@localhost

When I run:
set @id := 0 ;
call save_stop(@id,'Kamat Classic',NULL,15.475872602713768,73.81208726755833,2,NULL,2) ;
This results in
ER_NO_SUCH_USER: The user specified as a definer ('root'@'%') does not exist

But this works
call get_stops(2);

What is the reason behind the definer error? All procedures are defined with simple SQL such as :
drop procedure if exists save_stop//
create procedure save_stop(